156 Nelson- — New Squirrels from Mexico and Central America. 



heavily washed with white below and above. The amount of white on 

 tail agrees with purity of white on dorsal surface. 



Measurements. — Type specimen: Total length 506; tail vertebra? 261 ; 

 hind foot 67. Average of 5 adults: Total length, 515.4; tail vertebrae 

 2(13.2; hind foot, 67. 



Remarks.— The most common or typical forms of this extremely vari- 

 able squirrel are described above. They are notable among all of the 

 species and races of the group having nape and rami) patches for the 

 sharp contrast between the rich dark color of these patches and the 

 whitish or whitish-gray color on rest of upper surface which brings them 

 out in sharp relief. 



